KIM WOODS** Time To Practice- Psychology
**PLEASE USE ATTACHMENT**
These weekly worksheets give you experience in calculating (by hand or using SPSS) the formulas from the weekly readings. Understanding and performing these formulas allow you to more fully understand the theory of how and why statistical formulas work and what they tell you. These worksheets also provide you the opportunity to interpret results in the context of specific problems, which in turn provide experience that will assist you in critically evaluating current research in your field.
ABC/123 Version X | 1 |
Time to Practice: Week 2
PSYCH/625 Version 4 |
2 |
University of Phoenix Material
Time to Practice: Week 2
Complete Parts A, B, and C below.
1. Why is a z score a standard score? Why can standard scores be used to compare scores from different distributions?
2. For the following set of scores, fill in the cells. The mean is 74.13 and the standard deviation is 9.98.
Raw score | Z score |
68.0 | ? |
? | –1.6 |
82.0 | ? |
? | 1.8 |
69.0 | ? |
? | –0.5 |
85.0 | ? |
? | 1.7 |
72.0 | ? |
3. Questions 3a through 3d are based on a distribution of scores with and the standard deviation = 6.38. Draw a small picture to help you see what is required.
a. What is the probability of a score falling between a raw score of 70 and 80?
b. What is the probability of a score falling above a raw score of 80?
c. What is the probability of a score falling between a raw score of 81 and 83?
d. What is the probability of a score falling below a raw score of 63?
4. Jake needs to score in the top 10% in order to earn a physical fitness certificate. The class mean is 78 and the standard deviation is 5.5. What raw score does he need?
5. Using IBM® SPSS® software, conduct a frequency analysis on the gender and marital status variables. From the output, identify the following:
a. Percent of men
b. Mode for marital status
c. Frequency of divorced people in the sample
6. Using IBM® SPSS® software, create a frequency table to summarize the data on the educational level variable. Copy and paste the output from IBM® SPSS® into this worksheet.
Answer the questions below in at least 90 words. Be specific and provide examples when relevant.
Cite any sources consistent with APA guidelines.
Question | Answer |
What is the relationship between reliability and validity? How can a test be reliable but not valid? Can a test be valid but not reliable? Why or why not? | |
What are the four different levels of measurement? Explain and provide examples. | |
How does understanding probability help you understand statistics? |
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